diff --git a/utilities/column_aware_encoding_exp.cc b/utilities/column_aware_encoding_exp.cc
index 83a2bdb9c..cebbe6516 100644
--- a/utilities/column_aware_encoding_exp.cc
+++ b/utilities/column_aware_encoding_exp.cc
@@ -8,6 +8,7 @@
 #endif
 
 #include <cstdio>
+#include <cstdlib>
 
 #ifndef ROCKSDB_LITE
 #ifdef GFLAGS